Since 1989, the Boeing E-6 Mercury, often regarded as the 'deadliest plane in the world,' has been an integral part of the United States military fleet. However, as the model advances in age, a replacement pathway is needed. In April 2023, Northrop Grumman, along with partners Raytheon Intelligence & Space, Lockheed Martin, Crescent Systems Inc., and Long Wave Inc., unveiled the design for the Lockheed E-XX. The aircraft will replace the dated E-6 Mercury as a TACAMO (Take Charge And Move Out) strategic aircraft.